Sewing-machine



(No Model.) 4 2 sheets-sheet 1.

Z. T. FRENCH.

SEWING MACHINE.

No. 661,686, Patented June 2., 1696.

(No Model.) 2 sheetssheet 2.

Z.T.PRBNCH. SE WING MAGHINB.

No. 561,386. APatented June 2,1896.`

. @WHL lhvTTnn STATES PATENT Ormea.

ZAOI'IARY T. FRENCH, OF BOSTON, MASSACHUSETTS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 561,386, dated J une 2, 1896. Application filed May 14,1894. Serial No. 511,075. (No model.)

To all whom, t may concern.-

Be it known that I, ZAGHARY T. FRENCH, of Boston, county of Suffolk, State of Massa` chusetts, have invented an Improvement in Sewingdtiachin'es, of which the following description, in connection with the accompanying drawings, is a speciiication, like letters and ligures on the drawings representing like parts. l y

In sewing-machines using waxed thread the different parts against which the thread travels have to be kept quite hot, and for this purpose verymany plans have been devised, some depending upon the employment of gas and others upon heat derived from steam in pipes. The gas-flame is objectionable on many accounts, and when steam is used in customary manner the addition to the sewing mechanism of pipes to conduct the steam greatly complicates the machinery, and where a looper carried by a long lever has to be kept hot, steam has not up to the present time proved thoroughly eflicient.

My invention aims particularly to heat the loopercarrier and looper employed in the class of machine represented in United States Patent No. 412,704, dated October S, 1889.

To enable the looper and looper-carrier to be eftectually heated by steam as the heating medium, I have combined with the machine a block or plate of a metal possessing' great conductivity-such, for instance, as copperand this block or plate, preferably made hollow, is thoroughly heated by steam, or it may be other liquid, the block or plate being so located with relation to the looper-carrier or looper, or it may be other moving part to be heated, that said looper-carrier, looper, or other moving part during a portion of its cycle of movement is in contact for a greater or less portion of said movement with the said heated block or plate, the duration of contact being sufficiently long to enable the looper carrier, looper, or other movable part to become heated to such a degree that the wax on the thread controlled by said looper or other part is kept sufficiently soft to rend freely and. not injure said looper or other part.

Figure l, in side elevation, represents a sufficient portion of a sole-sewing machine of well-known construction with my i1nprovements added to enable my invention to be understood. Fig. 2 is a view of the parts shown in Fig. l., looking at said figure from the right; and Fig. 3 is a detail to be referred to.

Referring to the drawings, the framework A, the looper B2, its looper-lever BX, pivoted at B12 on the pivoted stud B13, the rock-shaft D, having an attached segment to which is connected the hooked needle a, the combined cast-off and needle-guide S, arm D5, connected to the rock-shaft D, the rock-shaft O5, its attached arm O3, the link O2, connected to said arm, the threadholder d, and the take-up lever b2, having the roll b3, over which Y the waxed thread passes, are and may be all substantially as in said Patent No. 412,704.

In accordance with my invention I have added to the head or framework of the machine-a metallic block or plate F of a metal highly sensitive to heat or a metal having the capacity of becoming quickly heated and of keeping its heat-such for instance, as copper-and in this instance of my invention I have provided to heat said block or plate by or through steam or other hot fluid flowing through a pipe F', suitably connected with a reservoir for supplying steam or other het fluid. l The block or plate is so located that when the looper is moved into the position shown best in Fig. 2, which position it occupies for a greater or less portion of the cycle of movement of the looper about the hooked needle, the said looper-carrier will bear directly against and be heated by conduction from the said plate.

Vhen the machine is at rest, the normal condition of the looper is against said heated block or plate, as represented in Fig. 2.

I have shown the steam-pipe F as so shaped that the conduction Fzthereof conducts steam through a casting F3, which in turn imparts heat to the arms O3 and b2, the steam passing from the said hollowlcasting F3 preferably back to a suitable exhaust.

The block or plate may, if desired, be hollow.

The arrows near the pipes F F2 show the direction in which the steam or other h o't iiuid travels.

It is obvious that other parts than the looper IOO and looper-earrier may be brought intermittin gly in contact with the block or plate, su chv as described, and be heated. Y

Having described my invention, what I claim, and desire to secure by Letters Patent, is-

In a sewing-machine, a block or plate heated by a Huid, and a looper and looper-carrier, combined with means to move the said earrier to put it in contact ntermittngly With the said heated block or plate, to thereby in the 

